Combined scavenging-pump and compressor.



0. F. PERSSON. COMBINED SCAVENGING PUMP AND COMPRESSOR.

APPLICATION FILED DEC.26, 1913. I

Patented Sept. 21,` 1915.

y Inventor: Y Ott@ F. Pere-550Wy b5: gggqtreg.

UNITED. STATES PATNT OFFICE.

' oTTo r. rERssoN, or ERIE, PENNSYLVANIA, AssIeNoR To GENERALELECTRIC COMPANY, A CORPORATION oF NEW' YORK.

COMBINED SCAVENGING-PUMP AND COMPRESSOR.

lTo all 'whom 'it may concern.'

Be it known that I, OTTO F. PERssoN, a

vvcitizen .of the United States, residing at plying air to the working cylindersof an internal combustion engine for scavenging cate with the pump cylinder.

the engine.

purposes and for supplying high pressure air for`injecting fuel intothejfcombustion chambers. v .-J'J

My invention has for its` to improve the construction of sichrapparatus by decreasing the overall height, decreasing the number of parts, and reducing the cost of manufacture. The improvement is directed chiefly to the constmxction of the scavenging pump, but certain-`features of the compressor are also modified to attain the desired results.

In the drawing whichv illustrates one of the embodiments of my invention,"is shown a combined scavenging pump and compressor in vertical section.

1 indicatesthe base of the engineand mounted thereon isa receiver 2 containing a chamber 3 that receives air from the scavenging pump. From this chamber air is supplied to the working cylinder yor cylinders for scavengingpurposes and also to the first stage o'f a multi-'cylinder compressor by a pipe 4 indicated by a broken and dottedv line. At one side of the pump is a double V acting' reciprocatingy valve 5 that controls the admission of air to and its discharge from said pump. It is actuated by a lever 6 that derives its motion from an eccentric 7 mounted on the main shaft 8 of Air 4enters the valve easing through a suitable screen 9. The valve casing`10 is supported by the base and has ports 11 and 12 at its ends which communi- Mounted on top of the receiver is a casing 13 which supports the low pressure cylinder 14 of ythe compressor, there being connectingiribs 15 between the two. The cylinder is provided with a head 16 in which there are one or more inlet valves 17 and one or more discharge valves 18. The head also supports the cylinder 19 of the highl specification` of I .efters Patent.

Patented Sept. 21, 1915.

Application filed December 26, 1913;. Serial No. 808,649.

pressure stage of the compressor. This latter cylinder is also provided with a head 20 containing an inlet-valve21 which receives its air from the valve 18 through the pipe 22, indicated by a broken and' dotted line. A discharge valve 23 is' also provided in the head and highpressure or blast air isconveyed therefrom by the pipe 24, indicated by a broken and dotted line. Surrounding the compressor and mounted. on the casing 13 is a cover 25 forming a cooling vwater jacket.

The pistons 26,27 and-.28 for the scavenging pump and high and low pressure stages of the compressor are formed in a single unit. The stages of the compressor are v single acting while the pump is double act-5 mg The Pump Piston is of relatively larg diameter and comprises a peripheral portion containing packing rings that is connected to the trunk of piston 27 by an inclined web 29, said web forming the head of the piston. The lower part of the cylinder 14 also terminates in an inclined web 30 which in addition to supporting said cylinder forms the lower wali ofthe chamber 31 for the cooling water and also the'upper head of the pumpv cylinder. vInside of the receiver is a liner 32 forming thec'ylinder for the pump. It is provided with ports on one side thatregister with ports `11 and 12 in the valve casing 10. The lower wall of inder comprises a part of relatively large diameter and a part of smaller diameter between vwhich the-piston moves.

The object of inclining thel webor'ghead i cient space for the connecting rod without however unduly increasingthe diameter; of the cylinder. Since the part 33 is inclined,

if small clearances are desired at the ends of the piston strokes', las in the present instance.

vIn order to guide the piston and prevent air from passing from the cylinder space it follows that the pump piston and the upper cylinder head must be similarly inclined receiver and cylinder head 33 it is evident that' considerable 'spacel 'in a vertical direc*- tion is saved because` the -Cylinders when considered together can be brought nearer to the main shait. Sulicient space is also provided for the connecting rod 37 to swing b'ack and forth as it is moved by the crank 38. Forming the pistons 26. and 27 in a single unit results in a saving in the' number of parts and also simplifies and reduces the cost of the machine work.

I regard it as being desirable to make all three pistons in a` single unit but this is not necessary. It will, however, be found preferable to make the pump and low pressure pistons as a vsingle unit yto reduce weight and cost of machining, and also to Aavoid special and irregular shapes and eXtra parts.

Arrangingthe tubularv member in tele-l scopic relation with the piston 27, besides decreasing the height of the apparatus as a whole, affords a simple means for forming the inner wall of the pump cylinder and also permits the use of a relatively long connecting rod, and one which can be connected 4 to the low pressure piston of the compressor,

as is desirable,

to obtain the most satisfactory operation. In 'addition to the features above specied the construction is advanta geous because the vparts may be readily taken down and reassembled lwhen necessary.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereofgbut I dcsireto have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means. l l What I claim as new and desire to secure by ALetters Patent of the United States, is

1. In an apparatus of the character described, the combination with a pair vof pistons comprising' a tubular member which forms one of them, an inclined web member surrounding it and having a peripheral portion which forms the other, a cylinderfor a connectingrodfor .extends through the nected to the rod, and valve means for the 100 the tubular piston member' anda cylinder- -for the other, said last named cylinder com-` prising a stationary member in telescopic rea secondpiston carried by the trunk of the iii-st, a stationary tubular member which projects into said trunk and forms ahead `and inner cylinder for the second piston, an outer cylinder for the second piston, a c linder for the trunk piston, valve means or' 75 the cylinders, and a driving means for the pistons.

3. In an apparatus f the character described, the combination of a trunk piston,

a second piston which comprises a peripheral `portion and an inclined web that conl nects it to the trunk of the first, an outer cylinder for the lsecond piston, a member comprising a tubular portion that is in telescopic relation with saidv trunk and forms a part ot a cylinder for the second piston and `has an inclined web which supports saidportionand forms a cylinder head, a cylinder for the trunkv piston, an inclined web for supporting it that also forms a head for the second cylinder, valve means for the cylin' 1 driving means for the pistons.

ders, and

'a' cylinder, a piston 4. In a combination, movable therein which has a central opening, a tubular member which makes a slid- 'i ving ftwith the.wall of said opening and forms one wall of a cylinder for the piston,

driving the piston that member, a shaft con,

cylinder. c

-5. In a combination, a base, a receiver mounted thereon, a cylinder located in the receiver, a trunk piston, a web attached'to the trunk andforming a second piston, a

hollow member supported by the receiver which is in telescopic relation with lsaid trunk and has a web forming a cylinder".

head, a cylinder for the trunk piston which is supported by that forms one head for the first named cylinder, valve means for the cylinders, and a driving means for the pistons.l

In witness whereof, I have hereunto set my hand `this 19th day of December 1913. oTTo F. PERssoN.'

Witnesses:

RUDOLF voN HUHN, GU'rsAv H. KAEMMERLING.

second stationary member surrounding it, 65

the receiver and hasV a web 

